Solar System 4.65 bya

We now come to only the second event in
this story to which we can give a definite date. The first was the creation of
the Universe, which took place about 13.7 billion years ago, and now we meet
the origin of the Solar System about 4.65 billion years ago.

Up until this point we have been giving
dates since the creation. From now on we will be able to give many more dates,
so this is a good time to remind ourselves about the way we show ages.